双EFP冲击引爆带盖板B炸药的累积毁伤效应

Cumulative Damage Effect on Shock Initiation of Covered Composition B by Dual EFP Impacts

为了研究多个爆炸成型弹丸(MEFP)对战斗部装药的冲击起爆问题,进行了单、双爆炸成型弹丸(EFP)冲击引爆带盖板B炸药的试验,测试了单EFP和双EFP对带盖板B炸药的冲击引爆能力,同时利用AUTODYN有限元软件开展了EFP对带盖板B炸药冲击引爆行为数值模拟研究,分别分析了单EFP和双EFP的成型过程、引爆带盖板B炸药的作用过程,获得了B炸药发生爆轰时的临界盖板厚度(Hc)。进一步,建立了双EFP同时引爆带盖板炸药临界条件的工程计算模型。试验结果表明:试验获得的EFP长18 mm,直径19 mm。单EFP冲击带盖板B炸药发生爆轰的临界盖板厚度范围为10 mm≤Hc<15 mm,而双EFP作用时的临界盖板厚度范围为15 mm≤Hc<20 mm。另一方面,数值模拟结果表明,在单EFP作用下,带盖板B炸药发生爆轰的临界盖板厚度为13 mm;而双EFP作用下,带盖板B炸药发生爆轰的临界盖板厚度为19 mm,相较于单EFP作用时的Hc提高了46.2%,数值模拟结果与试验结果吻合较好。工程模型能较准确地预测双EFP同时冲击起爆带盖板炸药的临界起爆速度。

In order to investigate the shock initiation of warhead charge by multiple explosively formed projectiles(MEFP)im-pacts,the shock initiation experiments of covered Composition B by single EFP and dual EFP were conducted to test the shock initiation capacity of single EFP and dual EFP on covered Composition B.Moreover,the numerical simulations on shock initia-tion of covered Composition B by EFP were carried out by AUTODYN finite-element software,the formation processes of single EFP and dual EFP and their shock initiation processes of covered Composition B,were analyzed respectively,and the critical cover plate thickness(Hc)for the detonation of Composition B was obtained.Further,an engineering calculation model of the critical initiation condition of covered charge with dual EFP was established.The experimental results show that the length of EFP is 18 mm and the diameter is 19 mm.The critical cover plate thickness range is 10 mm≤Hc<15 mm for shock initiation of cov-ered Composition B by single EFP impact,while the critical initiation cover plate thickness range is 15 mm≤Hc<20 mm for dual EFP impacts.Besides,the numerical simulation results show that the critical cover plate thickness is 13 mm for shock initiation of covered composition B by single EFP.While for the action of double EFP,the critical initiation cover plate thickness is 19 mm,which is 46.2%higher than that for single EFP.The numerical simulation results are consistent with experimental results.Finally,the calculation model can provide a good prediction of the critical initiation condition of the covered charge with dual EFP.